You can top up the balance from your Android device through the application Google Play Store -> Redeem!

Google Play market - this app is the union of all the shops in the Google one under the slogan: "Pure entertainment, wherever you do not want to." Shop Google Play merged into a single whole Android Market, Music Store, Videomagazine and store books. Google provides an excellent opportunity to gain access to your purchase at any time and from any device with Internet access, by providing a place to store the data in a single cloud service. Access to the service will be possible not only through special applications, but also via any WEB browser!